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EuSn3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Eu is bonded to twelve equivalent Sn atoms to form a mixture of face and corner-sharing EuSn12 cuboctahedra. All Eu–Sn bond lengths are 3.39 Å. Sn is bonded in a distorted square co-planar geometry to four equivalent Eu atoms.
Eu3Sn is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Eu is bonded in a distorted see-saw-like geometry to four equivalent Sn atoms. There are two shorter (3.59 Å) and two longer (3.73 Å) Eu–Sn bond lengths. Sn is bonded to twelve equivalent Eu atoms to form a mixture of face and corner-sharing SnEu12 cuboctahedra.